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Physics

Physics
How much mechanical work must be done to completely melt 1 gram of ice at 0°C ?

80 J
336 J
2268 J
4.2 J

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Physics
What device converts light energy to electrical energy?

Photodiode
Photovoltaic cell
Heliostats
Thermocouple

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Physics
If an object moves with constant velocity,

None of these
It must have constant speed
It must have constant direction
It must have constant speed in constant direction

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Physics
Liquids and gases never show

Electromagnetic property
Diamagnetic property
Paramagnetic property
Ferromagnetic property

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Physics
The best conductor of electricity among the following is :

Silver
Copper
Iron
Aluminium

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Physics
The commonly used coolant in refrigerators is

Ammonia
Oxygen
Nitrogen
Freon

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